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Sprayer thermal protection

a technology of thermal protection and sprayer, which is applied in the direction of motor/generator/converter stopper, dynamo-electric converter control, instruments, etc., to achieve the effect of maintaining an acceptable level of performance and enhancing the performance of the painter

Active Publication Date: 2007-06-14
GRACO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is a thermal protection system for painters that improves performance. It uses a thermistor to monitor the temperature of the sprayer and a control board to adjust the pressure and speed of the motor. The system also includes a requirement for control logic to adjust the motor while it is running to compensate for motor temperature rise after it has stopped. The technical effects of the invention include improved performance, use of a smaller and / or lighter motor, and better temperature control.

Problems solved by technology

This mode cools better with small spray tips because the fan speed is higher and there is a considerable amount of off time.

Method used

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Examples

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Embodiment Construction

[0009] As shown in FIG. 1, a 100 Kohm NTC thermistor 10 is placed in the brush holder 12 of the electric motor 14 in the sprayer 16 to monitor the temperature of the sprayer 16. The processor 18 on the control board 20 monitors the thermistor 10 output. At temperatures well below the limits of the motor 14, the sprayer 16 operates at the full selected pressure and variable speed for optimum performance.

[0010] As the temperature approaches allowable limits, several performance cutbacks can be used to prevent overheating. The preferred method is to gradually reduce the controlled pressure. If the temperature continues to rise, the control 20 switches to on / off or deadband control. This mode cools better with small spray tips because the fan speed (in the motor) is higher and there is a considerable amount of off time. If the temperature continues to rise in spite of these measures, the control 20 shuts the unit down.

[0011] An additional enhancement to the system is to include a requ...

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PUM

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Abstract

In an electric airless sprayer (16), as the motor (14) temperature approaches allowable limits, several performance cutbacks can be used to prevent overheating. The preferred method is to gradually reduce the controlled pressure. If the temperature continues to rise, the control (20) switches to on / off or deadband control. If the temperature continues to rise in spite of these measures, the control (20) shuts the unit down.

Description

TECHNICAL FIELD [0001] This application claims the benefit of U.S. Application Ser. No. 60 / 534,180, filed Jan. 2, 2004.BACKGROUND ART [0002] Electric airless paint sprayers are popular for applying architectural coatings to various structures. Such sprayers typically utilize either on / off (deadband) or variable speed control to maintain a set pressure. Such sprayers are typically provided with thermal protection which shuts off the sprayer when motor temperature exceeds a predetermined level. DISCLOSURE OF THE INVENTION [0003] It is therefore an object of this invention to provide a thermal protection system which provides enhanced performance to the painter. It is also an object of this invention to provide protection which allows use of a smaller and / or lighter motor while maintaining an acceptable level of performance. [0004] Towards that end a 100 Kohm NTC thermistor is placed in the brush holder of the electric motor in the sprayer to monitor the temperature of the sprayer. The...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H02H7/08A01G27/00B05B12/08B67D7/08H02H7/085
CPCB05B9/0403H02P29/0061H02H7/0852B05B12/08H02P29/66A01G27/00B67D7/08
Inventor LIND, ROBERT J.GILBERT, ROBERT G.
Owner GRACO INC